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Specifying C++11 or C++14 has long given a note: in 99% of CRAN packages the specification is unnecessary as the default C++17 suffices (in a few cases with a deprecation warning from some compilers). The intention is that support for those standards will be withdrawn before release.
‘diff(m, lag, dif)’ for matrix ‘m’ now still returns matrices, also when ‘lag * dif > nrow(m)’ (PR#18972, thanks to Mikael Jagan).